Common sense is the collection of prejudices acquired by age eighteen.
I cannot live without books.
Action not backed by knowledge and knowledge not translatable into action, both can not stand the test of time.
There is no authority who decides what is a good idea.
The only true wisdom is in knowing you know nothing.
A child miseducated is a child lost.
Although modesty is natural to man, it is not natural to children. Modesty only begins with the knowledge of evil.
Never help a child with a task at which he feels he can succeed.
Integrity without knowledge is weak and useless, and knowledge without integrity is dangerous and dreadful.
If one cannot enjoy reading a book over and over again, there is no use in reading it at all.
The progressive development of man is vitally dependent on invention.
Education is the most powerful weapon which you can use to change the world.
What is freedom of expression? Without the freedom to offend, it ceases to exist.
Books are as useful to a stupid person as a mirror is useful to a blind person.
It is not enough for the teacher to love the child. She must first love and understand the universe. She must prepare herself, and truly work at it.
If you want the present to be different from the past, study the past.
In mathematics you don't understand things. You just get used to them.
The task of a writer is not to solve the problem but to state the problem correctly.
Knowing others is wisdom, knowing yourself is Enlightenment.
If the facts don't fit the theory, change the facts.
Know what you are talking about.